ZHENGXI Isolation Transformer 120V to 120V,1000W Transformer Voltage Converter, HD Display, No Niose, 2 Output Sockets

Been using this for a 3-4 weeks, as my very old 1:1 transformer went tango/uniform after 50 years of use &. thought I would splurge with this replacement. The first thing I did was to open it up. It is very well constructed (especially for China production). It is wired EXACTLY as I would have wired for my service bench (set in the "special" switch position) & provides complete isolation from the mains supply & earth ground. Giving this a full 5 stars as I was expecting to have to make changes while I was inside the cabinet. So the other switch position has the outlet ground tied to one side of the output sockets (as expected). Anyway, if other arrangements would have been needed, adjustment to the wiring would have been easy to adjust inside the case.The LCD meter is a nice touch (the same product is available here on Amazon as a component). The Power Switch/Circuit Breaker is also appreciated (although it appears to be overrated in this case).It's also worth mentioning that the case of the unit is tied to the power cord ground (but NOT to the 2 outlets) as it should be.The heavest load I've used so far with this was about 9 amps which it handled with only a 1.6 volt drop. But thinking about this, I think I will limit this use to just a bit less than that.I have several pictures inside the case & will post as soon as I can find them...

Got my second one yesterday and it got bounced around in shipping from Texas to RI enough to dent outwards the sides from the core flexing on the mounting bolt as well as kink the base along one side bend lip. Should be shipped upright. The ground connects to the hot output terminal not ideal when the rear switch is on. The 120v socket is tight on the ground plug post it helps to taper the tip to insert easier, sockets look weird but work with USA plugs. Running 13+ amps will make power cords get hot even with heavy gauge cord. Work great to isolate a large boat from a ground fault.

I don’t know why my unit came with the hot and neutral wired backwards but they were. I’m glad I checked. Seems to be decent build quality. Soldered connections aren’t the greatest. The display is nice. When rewiring the hot and neutral, I cut back all terminated wires, re-tinned and resoldered everything. Also, with the switch in “special” position, isolation outputs are isolated from mains ground. When the switch is in the “standard” position, mains ground is present on the isolated outputs. FYI.

This transformer appears to work correctly in my cursory testing: A light bulb from isolated hot to isolated neutral lights, while from isolated hot to real earth ground or isolated neutral to real earth ground, the bulb does not light.The switch on the back, labeled "mode switching", in "standard" mode connects what is the hot pin on the isolated socket to the ground pin on the isolated socket. And in "special" mode, the GND is a no-connect and is lifted. I thought this was an odd choice and rewired it so the switch either passes through real earth ground or floats it--that is how this device should be wired. Thus 3 stars.Note: I didn't do an capacitance testing for coupling or voltage leakage testing. Such tests should be preformed before relying on this item as a safety device for electronics work.

Placing the standard - special selector switch in the special position eliminated most of the mains ground noise I was getting while measuring < 100 mV in a microcurrent sensing circuit. Worked great!Also, reading other reviews someone was critical of the non-US recepticals on the unit. I wanted to mention that the receptacles are “universal.” There is a small plastic guard inside the receptacle. If you lift it with a small screwdriver (power off of course) it will accept a standard US plug.So, don’t hesitate. The unit works well and is a great isolation transformer for a reasonable price!

Not sure but I don't see a way to plug in a three-prong us adapter into the unit I received. It looks like it's made for other countries but not the US. Show me on there where I can put a three prong US plug? I don't think they sent me the right unit. Disappointing. Not exactly feeling with the sense of safety, which is what I bought the unit for in the first place. I have no place for a Us grounded plug. And so how would I use the ground lift switch?I sent it back. Was going to buy another one on prime and see if maybe it was as pictured in the ad this time. What's the deal? I don't know how to contact the company. Frustrating.

1000W 120AC to 120AC isolation transformer by Zhejiang Zhengxi Electrical Technology Co. weighs about 20lb, and packed into 7"x4.75"x10" box with multi - function display(please see pictures with unloaded and loaded to portable digital oscilloscope) and on/off switch on front panel. On the back panel there are input power 120 VAC and 2 isolated 120VAC output sockets which accept USA and European? style power cords. Also on the back there is a switch(called Mode Switch) with Standard and Special positions for isolated 120 VAC. In Standard position ground and neutral are disconnected and in Special position they are connected. Please note that the case is grounded to the incoming 120 VAC power line ground wire. The transformer works pretty good so far(it is about1 month since I have it). Cons - metal case has very sharp corners, it is to easy to cut hands so I filed these and I also replaced these European style socket with US style ones. Nevertheless, all in all it worths all the money.

Works great and it can be used as a isolated power supply in testing audio amplifiers.

item as described. have not had a chance to use yet.

That is what I like from a product.